1. MIC5365-2.5YMT-TZ Substitution Conclusion Under strict evaluation of load current and input voltage conditions, the MIC5365-2.5YMT-TZ can serve as a conditional substitute. This conclusion is based on the following key differences: First, the maximum output current is reduced from 200mA to 150mA, which is the most critical limitation. After substitution, the system load must remain below 150mA with sufficient margin; otherwise, the regulator may trigger overcurrent protection or overheat. Second, the maximum input voltage is reduced from 6V to 5.5V, requiring that system input voltage peaks remain below 5.5V to avoid potential damage. Third, each device has distinct electrical performance trade-offs. The alternative part offers lower quiescent current (39µA vs. 60µA) and better low-frequency PSRR (80dB vs. 70dB @ 1kHz), which benefits light-load efficiency and power supply cleanliness. However, its dropout voltage (0.38V @ 150mA) must be evaluated in conjunction with its lower current rating; actual dropout performance may not provide an advantage. If the actual operating current in the application is ≤120mA, input voltage is ≤5.5V, and the package footprints (4-TMLF® and SSON) are compatible, then the substitution is technically feasible. Nevertheless, rigorous bench validation is mandatory.